Protective device for bus-bar circuits.



P. TORCHIU & H. R. VVDINJRGQJx PROTEGTWB DEVICE POB BUS BA?. mams,

APPLICATION FILED APB. 24 19M,

Patented 51123@ w15 I We 'PHILIP ToRcHIo Ann HARRY RAY woonaow, or NewlYORK, n.61.

PROT{ECIIVE}y `LEVICL FOR BUS-BAR CIRCUITS.

T0 all iti/om t may concern.'

e it known that we, Piiimr ToRoHio and HARRY R. iVoounow citizens of theUnited States, residing at l\ew York, in the county of .New York andState of New York, have d a certain new and useful Improvement inProtective Devices for Bus-Bar Circuits, of which the following is aspecification.

The invention is a protective device for bus-bar circuits, whereby thetotal current passing upon the circuit, by reason of a lt-ground, shortcircuit, or the liketherein is limited, and whereby the voltage lsgatcertain lportions of the circuit (to which branch or service leads areconnected) is currence of said fault.

e accompanying drawing is an electrical diagram symbolicallyillustrating our invention.

A is a bus-bar circuit, actance coils B, C, D in series. l.

E, F, G are alternating current generators respectively connected tosaid reactance coils at taps preferably midway between the coilterminals. I

H and I are branch leads connected to the circuit A at points J, K,respectivelyv between coils B, C and C, D. Under normal conditions, thewhole current from the generators is on the circuit A and will bedelivered to branches H, I. vBy reason of the above construction, if a.fault occurs in the circuit A-short circuit or ground, for example, sayat X`neverthe'less the voltage dellvered to the branches H, I will asbefore at one hundred per cent.

For purposes of explanation, Iassumey that the alternating currentgenerators instead of being connected to taps on the reactance coils areconnected to points on the circuit A outside of sai-d reactance coils.generators E', F, G', dotted lines, are shown connected in the drawingto circuit A at points M, N, Let the fault 'occur at X.

he drop in potential from E to X will ,resultv in the delivery of acurrent corresponding to say ten times full load-from F to X, by reasonof the presence of coil B the current may be say five times fullloadfrom G to X, the two coils B, C now intervening, the current may besay three times lin which three reare shown connected Specication ofLetters Patent. Application filed Apri124,

remain f Patented Mar. 30, 1915.

1914. Serial No. 834,067.-

full load. Hence the total current delivered to circuit A corresponds to(ten plus live plus three) eighteen times full-load, and the results mayprove disastrous. more, the voltage at the never reach one hundred thealternate path to the fault X, and ma be much less. With ourconstruction, the current from generator E passes through the left handsection of the reactance coil S in going to the fault X, and inductivelyadds in the right hand section of coil B a voltage equivalent to thevoltage drop' in generator E. Hence the voltage on the' remaining bussection J, K, etc., remain one hundred per cent. and the power issuplplied to'circuits H, I, etc from generators G, etc., at one hundredence no change in the between reactance coils and from this part of thecircuit one hundred per cent. voltage is delivered to branch leads Hindefinite number of per cent. voltage. voltage on circuit A B, C, D,etc.,

ing to but ten times instead of eighteen times full load.

e claim: l

1. In combination with a plurality of alternating current generators, acircuit inu cluding in series reactance coils equal in. number'to saidgenerators or erators; the said coils being tapped and connected at saidtaps to corresponding tergenerators or group of genen ators. f

2. In combination with a pluraity of alternating current generators, acircuit cluding in series reactance coils equal ir. number to saidgenerators or group of gen-- craters; the said coils being tapped andconnected at said taps to corresponding terminalsof said generators' orgroup of generatbrs, and branch leads connected to said circuit atpoints between said ils.

testimony whereof we have av ed our signatures in presence of two witnPHILIP TORCHIG. HARRY RAY WOODROW Witnesses:

A. H. LAw'mN' J. F. SINCLAIR.

group of gen-

